Apochromat

About: Apochromat is a research topic. Over the lifetime, 642 publications have been published within this topic receiving 7934 citations.

Second spectrum and distortion on the optical system of long focus and broad band parmerer of obtained by wave aberration(continue)

Abstract: The method is argued in the paper which is used to obtain dioptrie and radius of lens of optical system on the apparatus of artificial star by wave aberration In order to correct secondary spectrum and distortion, equal position chromatism and equal spherical aberration are retained in front and raer group in the long focu system, and the values of front is minus in positive optical path and raer plus in opposite Results required can be accurately obtained by wave aberration

Apochromatic athermal lens (versions)

Abstract: FIELD: optics.SUBSTANCE: invention can be used in optoelectronic devices operating in radiation 0.4-1 micron spectral range and in a wide range of temperatures, for example, in reconnaissance cameras with matrix radiation receivers. First version of lens design contains along the beam path a biconvex lens, second and third biconcave lens, fourth lens in the form of a positive meniscus whose concave side faces the image space, fifth lens in the form of a positive meniscus whose concave side faces the object space, sixth biconvex lens, seventh biconcave lens and eighth lens in the form of a positive meniscus whose concave side faces the image space. Two last lenses are characterized with aspherical surface. Lens of second version contains along the beam path a first lens in the form of positive meniscus whose concave side faces the image space, second biconcave lens, third biconvex lens, fourth lens in the form of a positive meniscus whose concave side faces the object space, fifth biconcave lens, sixth biconvex lens, seventh lens in the form of a negative meniscus and eighth lens in the form of a positive meniscus whose concave surfaces of the image space, ninth , tenth and eleventh lenses made in form of a positive, negative and positive menisci whose concave surfaces face to the image space. All lenses are single and spherical.EFFECT: larger linear field of vision, increase of rear section, reducing the angle of incidence of rays on the radiation receiver, wider spectral range with preservation of diffraction image quality.2 cl, 12 dwg, 3 tbl

Field Corrector Lens And Grens For The Starlab Ultraviolet Telescope. I. Photocathode On Window

Abstract: Parameters are given for a corrector lens design which will provide a 0.5 degree field of good definition from 134nm to 280nm at the Ritchey-Chretien focus of the F/2-F/15 Starlab 1-metre telescope. The optimization includes the window of the detector which is aspherized on the outside but not on the inside where the photocathode is deposited. The 130 mm diameter detector is preceded by two lenses, the first of which is convex-plano. Because this element has a flat surface it can be interchanged with other elements to either compensate for the chromatic aberration of filters (by making the lens thinner), and/or to provide dispersion for multi-object slitless spectroscopy. In the latter case, the interchanged element is wedged and has a course transmission grating deposited on the flat side. This combination of grating and lens is referred to as a grens.© (1983) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Design of macro-filter-lens with simultaneous chromatic and geometric aberration correction

Abstract: A macro-filter-lens design that can correct for chromatic and geometric aberrations simultaneously while providing for a long focal length is presented. The filter is easy to fabricate since it involves two spherical surfaces and a planar surface. Chromatic aberration correction is achieved by making all the rays travel the same optical distance inside the filter element (negative meniscus). Geometric aberration is corrected for by the lens element (plano–convex), which makes the output rays parallel to the optic axis. This macro-filter-lens design does not need additional macro lenses and it provides an inexpensive and optically good (aberration compensated) solution for macro imaging of objects not placed close to the camera.